Difference between list, tuple and dictionary in python

Differences and Applications of List, Tuple, Set and Dictionary in Python

Lists: are just like dynamic sized arrays, declared in other languages (vector in C++ and ArrayList in Java). Lists need not be homogeneous always which makes it the most powerful tool in Python.

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Differences and Applications of List, Tuple, Set and Dictionary in Python
Applications of List, Set, Tuple, and Dictionary
List vs tuple vs dictionary in Python
List Vs. Tuple Vs. Set Vs. Dictionary: Know the Difference Between List, Tuple, Set, and Dictionary in Python
Difference Between List, Tuple Set and Dictionary in Python
Choosing between List, Tuple and Dictionary
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Tuple: A Tuple is a collection of Python objects separated by commas. In some ways, a tuple is similar to a list in terms of indexing, nested objects, and repetition but a tuple is immutable, unlike lists that are mutable.

Set: A Set is an unordered collection data type that is iterable, mutable, and has no duplicate elements. Python’s set class represents the mathematical notion of a set.

Dictionary: in Python is an ordered (since Py 3.7) [unordered (Py 3.6 & prior)] collection of data values, used to store data values like a map, which, unlike other Data Types that hold only a single value as an element, Dictionary holds key:value pair. Key-value is provided in the dictionary to make it more optimized.

List, Tuple, Set, and Dictionary are the data structures in python that are used to store and organize the data in an efficient manner.

List	Tuple	Set	Dictionary
List is a non-homogeneous data structure that stores the elements in single row and multiple rows and columns	Tuple is also a non-homogeneous data structure that stores single row and multiple rows and columns	Set data structure is also non-homogeneous data structure but stores in single row	Dictionary is also a non-homogeneous data structure which stores key value pairs
List can be represented by [ ]	Tuple can be represented by ( )	Set can be represented by { }	Dictionary can be represented by { }
List allows duplicate elements	Tuple allows duplicate elements	Set will not allow duplicate elements	Set will not allow duplicate elements and dictionary doesn’t allow duplicate keys.
List can use nested among all	Tuple can use nested among all	Set can use nested among all	Dictionary can use nested among all
Example: [1, 2, 3, 4, 5]	Example: (1, 2, 3, 4, 5)	Example: {1, 2, 3, 4, 5}	Example: {1, 2, 3, 4, 5}
List can be created using list() function	Tuple can be created using tuple() function.	Set can be created using set() function	Dictionary can be created using dict() function.
List is mutable i.e we can make any changes in list.	Tuple is immutable i.e we can not make any changes in tuple	Set is mutable i.e we can make any changes in set. But elements are not duplicated.	Dictionary is mutable. But Keys are not duplicated.
List is ordered	Tuple is ordered	Set is unordered	Dictionary is ordered (Python 3.7 and above)
Creating an empty list l=[]	Creating an empty Tuple t=()	Creating a set a=set() b=set(a)	Creating an empty dictionary d={}

Below is the program for implementation of List, tuple, set, and dictionary:

Python3

# Python3 program for explaining
# use of list, tuple, set and 
# dictionary
# Lists

l = []
# Adding Element into list

l.append(5)

l.append(10)

print("Adding 5 and 10 in list", l)
# Popping Elements from list
l.pop()

print("Popped one element from list", l)

print()
# Set

s = set()
# Adding element into set

s.add(5)

s.add(10)

print("Adding 5 and 10 in set", s)
# Removing element from set

s.remove(5)

print("Removing 5 from set", s)

print()
# Tuple

t = tuple(l)
# Tuples are immutable

print("Tuple", t)

print()
# Dictionary

d = {}
# Adding the key value pair

d[5] = "Five"

d[10] = "Ten"

print("Dictionary", d)
# Removing key-value pair

del d[10]

print("Dictionary", d)

Output Adding 5 and 10 in list [5, 10] Popped one element from list [5] Adding 5 and 10 in set {10, 5} Removing 5 from set {10} Tuple (5,) Dictionary {5: 'Five', 10: 'Ten'} Dictionary {5: 'Five'}

Applications of List, Set, Tuple, and Dictionary

List:

Used in JSON format
Useful for Array operations
Used in Databases

Tuple:

Used to insert records in the database through SQL query at a time.Ex: (1.’sravan’, 34).(2.’geek’, 35)
Used in parentheses checker

Set:

Finding unique elements
Join operations

Dictionary:

Used to create a data frame with lists
Used in JSON

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List vs tuple vs dictionary in Python

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List and Tuple objects are sequences. A dictionary is a hash table of key-value pairs. List and tuple is an ordered collection of items. Dictionary is unordered collection.

List and dictionary objects are mutable i.e. it is possible to add new item or delete and item from it. Tuple is an immutable object. Addition or deletion operations are not possible on tuple object.

Each of them is a collection of comma-separated items. List items are enclosed in square brackets [], tuple items in round brackets or parentheses (), and dictionary items in curly brackets {}

>>> L1=[12, "Ravi", "B.Com FY", 78.50] #list >>> T1=(12, "Ravi", "B.Com FY", 78.50)#tuple >>> D1={"Rollno":12, "class":"B.com FY", "precentage":78.50}#dictionary

List and tuple items are indexed. Slice operator allows item of certain index to be accessed

>>> print (L1[2]) B.Com FY >>> print (T1[2]) B.Com FY

Items in dictionary are not indexed. Value associated with a certain key is obtained by putting in square bracket. The get() method of dictionary also returns associated value.

>>> print (D1['class']) B.com FY >>> print (D1.get('class')) B.com FY

Jayashree

Published on 08-Feb-2018 20:04:00

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List Vs. Tuple Vs. Set Vs. Dictionary: Know the Difference Between List, Tuple, Set, and Dictionary in Python

All of these are elements used in the Python language, but there is a fundamental difference between list, tuple, set, and dictionary in Python. We will discuss the same in detail ahead, but let us first know a bit more about each of these.

Difference Between List, Tuple Set and Dictionary in Python

Learn about difference between list, tuple set and dictionary in Python.

Rajpreet Singh Nayyar

1 Dec 2021-9 mins read

Lists

A list is a collection where you can put your values using square brackets, which is ordered and changeable. You can put several data-types in a list, such as integers, strings, and booleans. An example of a list would look like this:

list_of_shoes = ["Adidas", "Reebok", "Nike"]

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To access a value within a list, you have to use index numbers. For example, if we want to access the second value in the list, we need to use the index number 1 (Computers counts from zero). To access a value within a list would look like this:

>>> list_of_shoes[1] Reebok # Output

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You can also change the value within a list. For example, we want to change the third item on the list. We need to access it using an index number, which would look like this:

>>> list_of_shoes[2] = "Converse" >>> list_of_shoes list_of_shoes = ["Adidas", "Reebok", "Converse"] # output

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Choosing between List, Tuple and Dictionary

List, Tuple and Dictionary are three of the popular data structures that are used by beginners to advanced programmers to store data. However, for someone who is starting their journey in programming, the difference between them could be confusing.

In this article, i will attempt to present the difference between the three data structures in terms of the following:
1. The memory space…